in 2003, waters, felten and sahai introduced a novel cryptographic primitive called incomparable public key cryptosystem to protect anonymity of message receivers in an untrusted network. in this setting, a receiver is allowed to create many anonymous identities for himself without divulging the fact that all these identities refer to the same receiver. recently, lee and lim improved the soluti...

Online Social Networks (OSN) becomes the largest infrastructure for social interactions like: making relationship, sharing personal experiences and service delivery. Nowadays social networks have been widely welcomed by people. Most of the researches about managing privacy protection within social networks sites (SNS), observes users as owner of their information. However, individuals cannot co...

1. introduction cities are geographic phenomenon that always leads major developments in human history. they are not only interacting with their local hinterland, but also interacting with other cities in economic and social fields. with increasing developments in recent decades in different areas, more placements for cities and geographical studies have been provided again. among the reasons t...

Abstract Privacy and data protection are concerns raised about most digital technologies. The advance of artificial intelligence (AI) has given even higher levels prominence to these concerns. Three cases presented as examples highlight the way in which AI can affect or exacerbate privacy first deals with use private authoritarian regimes. second looks at implications genetic data. third proble...

In the last few decades, technological progress has been made important information systems that require high security, Use safe and efficient methods for protecting their privacy. It is a major challenge to Protecting vital data and the ability to threaten attackers. And this has made it important and necessary to be sensitive to the authentication and identify of individuals in confidential n...

In the last few decades, technological progress has been made important information systems that require high security, Use safe and efficient methods for protecting their privacy. It is a major challenge to Protecting vital data and the ability to threaten attackers. And this has made it important and necessary to be sensitive to the authentication and identify of individuals in confidential n...

it’s not long since the advent of pervasive computing by mark weiser and one of its main usages is in healthcare systems. as this technology has been introduced only recently in this field and because we are dealing with peoples’ lives and their data, providing a high level of privacy and security is of great importance. various studies have been performed in which a certain method has been use...